Latissimus Dorsi

Musculus latissimus dorsi

Upper Body BackLatsPullPosterior Chain

The latissimus dorsi is the broadest muscle of the back and the prime mover for shoulder extension and adduction, pulling the humerus down and back. It drives pull-ups, chin-ups, lat pulldowns, and rows, and is the muscle most responsible for the V-taper width of the upper back.

Actions

Shoulder extension, Shoulder adduction, Shoulder internal rotation, Shoulder transverse extension

Origin

Spinous processes of T7-T12, thoracolumbar fascia, iliac crest, inferior three or four ribs, and inferior angle of the scapula

Insertion

Floor of the intertubercular (bicipital) groove of the humerus

Innervation

Thoracodorsal nerve (C6-C8)

Blood supply

Thoracodorsal artery (from the subscapular artery), with dorsal perforating branches of the lower posterior intercostal and lumbar arteries

Wikipedia ↗

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